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init: Use busybox ash

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init must use busybox ash because it is used on legacy-flash boards.
Change shebang, move needed functions to ash_functions.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
This commit is contained in:
Jonathon Hall 2023-03-13 12:26:41 -04:00
parent 55b3fcfe1a
commit 0760b6f237
No known key found for this signature in database
GPG Key ID: 1E9C3CA91AE25114
3 changed files with 48 additions and 44 deletions
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43
initrd/etc/ash_functions
View File

@ -42,3 +42,46 @@ preserve_rom() {
fi
done
}
recovery() {
TRACE "Under /etc/functions:recovery"
echo >&2 "!!!!! $*"
# Remove any temporary secret files that might be hanging around
# but recreate the directory so that new tools can use it.
#safe to always be true. Otherwise "set -e" would make it exit here
shred -n 10 -z -u /tmp/secret/* 2> /dev/null || true
rm -rf /tmp/secret
mkdir -p /tmp/secret
# ensure /tmp/config exists for recovery scripts that depend on it
touch /tmp/config
if [ "$CONFIG_TPM" = "y" ]; then
tpmr extend -ix 4 -ic recovery
fi
while [ true ]
do
echo >&2 "!!!!! Starting recovery shell"
sleep 1
if [ -x /bin/setsid ]; then
/bin/setsid -c /bin/sh
else
/bin/sh
fi
done
}
pause_recovery() {
TRACE "Under /etc/functions:pause_recovery"
read -p $'!!! Hit enter to proceed to recovery shell !!!\n'
recovery $*
}
combine_configs() {
TRACE "Under /etc/functions:combine_configs"
cat /etc/config* > /tmp/config
}

42
initrd/etc/functions
View File

@ -33,44 +33,6 @@ DO_WITH_DEBUG() {
"$@"
}
recovery() {
TRACE "Under /etc/functions:recovery"
echo >&2 "!!!!! $*"
# Remove any temporary secret files that might be hanging around
# but recreate the directory so that new tools can use it.
#safe to always be true. Otherwise "set -e" would make it exit here
shred -n 10 -z -u /tmp/secret/* 2> /dev/null || true
rm -rf /tmp/secret
mkdir -p /tmp/secret
# ensure /tmp/config exists for recovery scripts that depend on it
touch /tmp/config
if [ "$CONFIG_TPM" = "y" ]; then
tpmr extend -ix 4 -ic recovery
fi
while [ true ]
do
echo >&2 "!!!!! Starting recovery shell"
sleep 1
if [ -x /bin/setsid ]; then
/bin/setsid -c /bin/sh
else
/bin/sh
fi
done
}
pause_recovery() {
TRACE "Under /etc/functions:pause_recovery"
read -p $'!!! Hit enter to proceed to recovery shell !!!\n'
recovery $*
}
pcrs() {
if [ "$CONFIG_TPM2_TOOLS" = "y" ]; then
tpm2 pcrread sha256
@ -345,10 +307,6 @@ replace_config() {
sort ${CONFIG_FILE}.tmp | uniq > ${CONFIG_FILE}
rm -f ${CONFIG_FILE}.tmp
}
combine_configs() {
TRACE "Under /etc/functions:combine_configs"
cat /etc/config* > /tmp/config
}
update_checksums()
{

7
initrd/init
View File

@ -1,4 +1,7 @@
#!/bin/bash
#! /bin/ash
# Note this is used on legacy-flash boards that lack bash, it runs with busybox
# ash. Calls to bash scripts must be guarded by checking config.
mknod /dev/ttyprintk c 5 3
echo "hello world" > /dev/ttyprintk
@ -48,7 +51,7 @@ fi
hwclock -l -s
# Read the system configuration parameters
. /etc/functions
. /etc/ash_functions
. /etc/config
TRACE "Under init"